Apart from that, the Flame Ghost Avatar could also cast all the non-body tempering techniques Levi had mastered, albeit with some distinctions.
When casting spells from the Burning Faction, it could benefit from the Fire Ghost's fire element body, making its power even stronger than when Levi cast it himself.
When casting Ice and Water spells, which countered Fire spells, the power was slightly weaker compared to Levi's casting.
For spells from other factions, the difference was negligible compared to Levi's casting.
The Flame Ghost Avatar itself had no consciousness. It merely served as Levi's second body, akin to Levi's creation, the Deep Blue Sage Avatar.
However, unlike the Deep Blue Sage Avatar, which could only cast body tempering techniques and not innate spells, the Flame Ghost Avatar was the opposite.
If the Deep Blue Sage Avatar was a "body-tempering clone", then the Flame Ghost Avatar was a "spellcasting clone".